Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Basic Computation Of EPS) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Basic Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockolders Equity [Line Items]                      
Net income                 $ 106,401 $ 33,718 $ 130,294
Add: Noncontrolling interest in consolidated joint ventures                 1,216 1,018 651
Add (deduct): Noncontrolling interest in Operating Partnership                 (9,527) (2,711) (13,721)
Deduct: Redeemable noncontrolling interest                 (13,979) (8,840)  
Deduct: Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (11,425) (17,951)  
Net income available to common shareholders for basic earnings per share                 $ 72,686 $ 5,234 $ 117,224
Weighted average common shares                 90,388 90,005 89,746
Net income available to common shareholders $ 0.45 $ (0.05) $ (0.05) $ 0.45 $ (0.01) $ 0.39 $ (0.44) $ 0.11 $ 0.80 $ 0.06 $ 1.31
Mack-Cali Realty LP [Member]                      
Stockolders Equity [Line Items]                      
Net income                 $ 106,401 $ 33,718 $ 130,294
Add: Noncontrolling interest in consolidated joint ventures                 1,216 1,018 651
Deduct: Redeemable noncontrolling interest                 (13,979) (8,840)  
Deduct: Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (12,721) (20,025)  
Net income available to common shareholders for basic earnings per share                 $ 80,917 $ 5,871 $ 130,945
Weighted average common units                 100,634 100,410 100,245
Net income available to common shareholders $ 0.45 $ (0.05) $ (0.05) $ 0.45 $ (0.01) $ 0.39 $ (0.44) $ 0.11 $ 0.80 $ 0.06 $ 1.31